states. he sails more arrests will follow. meanwhile, two u.s. destroyers have been positioned off the coast of libya and an elite team of 50 u.s. marines has arrived here to guard the u.s. embassy and to assess security. nonessential personnel have been evacuated to germany. the mood here on the streets, calm but tense. people here coming up to us, saying, please tell the people in america we are so sorry. now, let's turn to my colleague, martha raddatz, with more on what we are learning about security that night. >> reporter: jeffrey, this new view of the consulate where that five-hour attack raged shows few signs of security before the attack. the small guard shack just inside the compound easily breached. cutting a clear path to the main building where two americans were killed, while two others were in the house used as a safe haven. it's where some of the employees had taken refuge during the attack. we now know that inside that battle, a former navy s.e.a.l. >> we did evaluate the thre